<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 
        页内css(在同一个thml页面内将css代码和html代码分离)
        1.在head标签中设置style标签
        2.选择器{属性:属性值;属性:属性值;}
         */
        div{
            color: red;
            font-size: 60px;
        }
    </style>
</head>
<body>
    <div>hello 杰克</div>
</body>
</html>